#include "head.h"

int main() {
  int x, y;
  x = 2;
  y = 1;
  printf("%d + %d = %d\n", x, y, sum(x, y));
  printf("%d + %d = %d\n", x, y, del(x, y));
  printf("%d + %d = %d\n", x, y, mul(x, y));
  printf("%d + %d = %d\n", x, y, div(x, y));
  return 0;
}
